// SPDX-License-Identifier: GPL-2.0
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/*
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* USB Debug cable driver
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*
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* Copyright (C) 2006 Greg Kroah-Hartman <greg@kroah.com>
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*/
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#include <linux/gfp.h>
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#include <linux/kernel.h>
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#include <linux/tty.h>
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#include <linux/module.h>
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#include <linux/usb.h>
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#include <linux/usb/serial.h>
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#define USB_DEBUG_MAX_PACKET_SIZE 8
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#define USB_DEBUG_BRK_SIZE 8
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static const char USB_DEBUG_BRK[USB_DEBUG_BRK_SIZE] = {
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0x00,
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0xff,
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0x01,
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0xfe,
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0x00,
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0xfe,
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0x01,
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0xff,
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};
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(0x0525, 0x127a) },
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{ },
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};
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static const struct usb_device_id dbc_id_table[] = {
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{ USB_DEVICE(0x1d6b, 0x0010) },
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{ USB_DEVICE(0x1d6b, 0x0011) },
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{ },
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};
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static const struct usb_device_id id_table_combined[] = {
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{ USB_DEVICE(0x0525, 0x127a) },
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{ USB_DEVICE(0x1d6b, 0x0010) },
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{ USB_DEVICE(0x1d6b, 0x0011) },
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{ },
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};
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MODULE_DEVICE_TABLE(usb, id_table_combined);
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/* This HW really does not support a serial break, so one will be
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* emulated when ever the break state is set to true.
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*/
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static void usb_debug_break_ctl(struct tty_struct *tty, int break_state)
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{
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struct usb_serial_port *port = tty->driver_data;
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if (!break_state)
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return;
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usb_serial_generic_write(tty, port, USB_DEBUG_BRK, USB_DEBUG_BRK_SIZE);
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}
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static void usb_debug_process_read_urb(struct urb *urb)
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{
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struct usb_serial_port *port = urb->context;
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if (urb->actual_length == USB_DEBUG_BRK_SIZE &&
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memcmp(urb->transfer_buffer, USB_DEBUG_BRK,
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USB_DEBUG_BRK_SIZE) == 0) {
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usb_serial_handle_break(port);
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return;
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}
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usb_serial_generic_process_read_urb(urb);
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}
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static struct usb_serial_driver debug_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "debug",
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},
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.id_table = id_table,
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.num_ports = 1,
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.bulk_out_size = USB_DEBUG_MAX_PACKET_SIZE,
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.break_ctl = usb_debug_break_ctl,
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.process_read_urb = usb_debug_process_read_urb,
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};
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static struct usb_serial_driver dbc_device = {
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.driver = {
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.owner = THIS_MODULE,
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.name = "xhci_dbc",
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},
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.id_table = dbc_id_table,
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.num_ports = 1,
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.break_ctl = usb_debug_break_ctl,
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.process_read_urb = usb_debug_process_read_urb,
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};
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static struct usb_serial_driver * const serial_drivers[] = {
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&debug_device, &dbc_device, NULL
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};
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module_usb_serial_driver(serial_drivers, id_table_combined);
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MODULE_LICENSE("GPL v2");
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